Karatsu Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Karatsu.
Climate overview of Karatsu
Karatsu, Saga, Japan, experiences significant temperature variation throughout the year. Summers bring daytime highs of 31°C (88°F) in August, while winters cool to 11°C (52°F) in January.
The city receives considerable rainfall, with around 1825 mm (72 in) annually. June is the wettest month. It has a distinct rainy season from June to September, with very warm summers and cold winters. The sunniest month is May, with 6.8 hours of sunshine per day on average.
Karatsu Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Karatsu - and find the best time to visit.
Monthly Temperature in Karatsu
Depending on the time of the year, temperatures range from very warm to chilly in Karatsu. Typically, average maximum daytime temperatures range from a very warm 31°C (88°F) in August to a chilly 11°C (52°F) in the coolest month, January.
Nights vary from 26°C (79°F) in August to around 5°C (41°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Karatsu
Karatsu has a relatively rainy climate with high precipitation levels, averaging 1825 mm (72 in) of rainfall annually. The climate in Karatsu shows significant variation throughout the year. Expect heavy rainfall in June, the wettest month, with an average of 306 mm (12 in) of precipitation over 18 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 82 mm (3.2 in) of rainfall over 19 rainy days. For more details, please visit our Karatsu Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Karatsu
For those who appreciate different seasons, Karatsu serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 6.8 hours of sunshine daily, and embrace the darker days in January, offering only 3.4 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Karatsu by Month
The relative humidity is high throughout the year in Karatsu.
The city experiences its highest humidity in July, reaching 76%. In January, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Karatsu
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, October and November
- Warmest weather: July and August
- Most sunshine: May and August
- Fewest rainy days: April, May, October and November
- Wettest months: June, July, August and September, when rainfall is highest.
- Seasonal pattern: A distinct rainy season from June to September, with very warm summers and cold winters
Frequently asked questions about the climate in Karatsu
What is the best time to visit Karatsu?
May, October and November typically offer the most optimal weather in Karatsu. In contrast, June and July tend to have less optimal conditions. Karatsu has a distinct rainy season from June to September, with very warm summers and cold winters.
What temperatures can I expect in Karatsu?
Daytime highs range from 11°C (52°F) in January to 31°C (88°F) in August. Nighttime lows range from 5°C (41°F) to 26°C (79°F). Temperatures vary considerably through the year.
How much rain does Karatsu get?
Annual rainfall is around 1825 mm (72 in). June is the wettest month with 306 mm (12 in), while January is the driest with 82 mm (3.2 in).
How sunny is Karatsu?
Karatsu receives around 1,894 hours of sunshine per year. May is the sunniest month with 205 hours, while January is the cloudiest with just 103 hours.
Karatsu 3-Day Forecast
Karatsu on the map
Karatsu is highlighted - select any city to see its climate.
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